• The Korean Journal of Physiology and Pharmacology
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• 제22권6호
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• pp.607-616
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• 2018

The effect of melatonin on juveniles with cardio fibrosis is poorly understood. We investigated whether HDACs participate in the anti-fibrotic processes regulated by melatonin during hypertrophic remodeling. Abdominal aortic constriction (AAC) was employed in juvenile rats resulting in pressure overload-induced ventricular hypertrophy and melatonin was subsequently decreased via continuous light exposure for 5 weeks after surgery. AAC rats displayed an increased cross-sectional area of myocardial fibers and significantly elevated collagen deposition compared to sham-operated rats, as measured by HE and Masson Trichrome staining. Continuous light exposure following surgery exacerbated the increase in the cross-sectional area of myocardial fibers. The expression of HDAC1, HDAC2, HDAC3, HDAC4 and HDAC6 genes were all significantly enhanced in AAC rats with light exposure relative to the other rats. Moreover, the protein level of $TNF-{\alpha}$ was also upregulated in the AAC light exposure groups when compared with the sham. However, Smad4 protein expression was unchanged in the juveniles' hearts. In contrast, beginning 5 weeks after the operation, the AAC rats were treated with melatonin (10 mg/kg, intraperitoneal injection every evening) or vehicle 4 weeks, and sham rats were given vehicle. The changes in the histological measures of cardio fibrosis and the gene expressions of HDAC1, HDAC2, HDAC3, HDAC4 and HDAC6 were attenuated by melatonin administration. The results reveal that melatonin plays a role in the development of cardio fibrosis and the expression of HDAC1, HDAC2, HDAC3, HDAC4 and HDAC6 in cardiomyocytes.

• Clinical and Experimental Pediatrics
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• 제45권3호
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• pp.390-394
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• 2002

Wilms 종양은 소아기에 발생하는 고형중양 중 6- 7%를 차지하며 소아에서 신장에 발생하는 고형종양 중 가장 흔한 것으로 진단시 정중연령은 3-5세이고 대부분 10세 이하에서 발견된다. 무증상성 복부종괴로 발견되는 경우가 많으며 하대정맥을 침범하는 경우는 4-10%에서 발견되며 우심방까지 침범한 경우도 0.5- 3%로 발견되나 우심실까지 침범한 경우는 아직 보고된 바가 없다. 2년 7개월 된 남자 환아로 내원 2개월 전부터의 간헐적 혈뇨 및 복통을 주소로 내원 하였다. 내원 당시 이학적 검사상 심잡음이 청진 되었으며 심한 복부팽만과 늑골하 종괴가 촉지 되었다. 이에 시행한 복부 초음파, 전산화 단층촬영 및 심에코상 우측 신장에서 기시하여 하대정맥을 통해 우심방과 우심실까지 침범한 종괴가 관찰되었다. 수술 전 항암 화학요법을 시행 받았으며, 항암 화학요법 후 20일째 수술을 하여 모든 종괴를 제거 후 조직학적 소견상 Wilms 종양을 확진 받았다. 환아는 수술후 방사선 치료 및 항암 화학 요법을 진행 중이다. 저자들은 우측 신장에서 기원하여 하대정맥을 통해 우심방 및 우심실까지 종양색전을 형성한 Wilms 종양 환아 1례를 경험하였기에 보고하는 바이다.

• Journal of Chest Surgery
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• 제55권5호
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• pp.364-377
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• 2022

An anatomical understanding of the atrial myocardium is crucial for surgeons and interventionists who treat atrial arrhythmias. We reviewed the anatomy of the inter-nodal and intra-atrial conduction systems. The anterior inter-nodal route (#1) arises from the sinus node and runs through the ventral wall of the atrial chambers. The major branch of route #1 approaches the atrioventricular node from the anterior aspect. Other branches of route #1 are Bachmann's bundle and a vestibular branch around the tricuspid valve. The middle inter-nodal route (#2) begins with a broad span of fibers at the sinus venarum and extends to the superior limbus of the oval fossa. The major branch of route #2 joins with the branch of route #1 at the anterior part of the atrioventricular node. The posterior inter-nodal route (#3) is at the terminal crest and gives rise to many branches at the pectinate muscles of the right atrium and then approaches the posterior atrioventricular node after joining with the vestibular branch of route #1. The branches of the left part of Bachmann's bundle and the branches of the second inter-nodal route form a thin myocardial network at the posterior wall of the left atrium. These anatomical structures could be categorized into major routes and side branches. There are 9 or more anatomical circles in the atrial chambers that could be structural sites for macro re-entry. The implications of normal and abnormal structures of the myocardium for the pathogenesis and treatment of atrial arrhythmias are discussed.

• Clinical and Experimental Pediatrics
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• 제51권11호
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• pp.1236-1240
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• 2008

Smith-Lemli-Opitz 증후군은 콜레스테롤 합성 과정의 장애로 발생하는 상염색체 열성으로 유전되는 드문 질환으로 다양한 기형을 동반한다. 이는 DHCR7 유전자 변이로 인한 활성도 저하로 발생하는 질환으로 7DHC, 8DHC의 증가 및 체내 콜레스테롤의 감소에 따른 임상상을 특징으로 한다. 저자들은 국내에서 최초로 SLO 증후군을 유전자 분석을 통하여 진단하였기에 이를 문헌 고찰과 함께 보고하는 바이다.

• Journal of Chest Surgery
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• 제47권5호
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• pp.444-450
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• 2014

Background: We aimed to evaluate the efficacy and safety of early surgical ligation (within 15 days of age) over late surgical ligation (after 15 days of age) by a comparative analysis of very low birth weight (VLBW) infants undergoing surgical correction for symptomatic patent ductus arteriosus (PDA) over the course of 6 years in our hospital. Methods: We retrospectively reviewed all the medical records in the neonatal intensive care unit at Hanyang University Seoul Hospital, from March 2007 to May 2013, to identify VLBW infants (<1,500 g) who underwent surgical PDA ligation. Results: The gestational age (GA) in the late ligation (LL) group was significantly younger than in the early ligation (EL) group (p=0.010). The other baseline characteristics and preoperative conditions did not differ significantly between the two groups. The intubation period before surgery (p<0.001) and the age at surgery (p<0.001) were significantly different. The postoperative clinical outcomes of the study patients, including major morbidity and mortality, are summarized. There were no significant differences in bronchopulmonary dysplasia, sepsis, or mortality between the EL and the LL groups. However, the LL group was significantly associated with an increased risk of necrotizing enterocolitis (p=0.037) and with a prolonged duration of the total parenteral nutrition (p=0.046) after adjusting for GA. Conclusion: Early surgical ligation for the treatment of PDA that failed to close after medical treatment or in cases contraindicated for medical treatment might be desirable to reduce the incidence of necrotizing enterocolitis and to alleviate feeding intolerance in preterm infants.

• Journal of Chest Surgery
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• 제50권4호
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• pp.242-246
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• 2017

Background: Patent ductus arteriosus (PDA) ligation is usually performed by congenital cardiac surgeons. However, due to the uneven distribution of congenital cardiac surgeons in South Korea, many institutions depend solely on adult cardiac surgeons for congenital cardiac diseases. We report the outcomes of PDA ligations performed by adult cardiac surgeons at our institution. Methods: The electronic medical records of 852 neonates at Chung-Ang University Hospital, Seoul, South Korea from November 2010 to May 2014 were reviewed to identify patients with PDA. Results: Of the 111 neonates with a diagnosis of PDA, 26 (23%) underwent PDA ligation. PDAs were ligated within 28 days of birth (mean, $14.5{\pm}7.8days$), and the mean gestational age of these patients was $30.3{\pm}4.6weeks$ (range, 26 to 40 weeks) with a mean birth weight of $1,292.5{\pm}703.5g$ (range, 480 to 3,020 g). No residual shunts through the PDA were found on postoperative echocardiography. There was 1 case of 30-day mortality (3.8%) due to pneumonia, and 6 cases of in-hospital mortality (23.1%) after 30 days, which is comparable to results from other centers with congenital cardiac surgery programs. Conclusion: Although our outcomes may not be generalizable to all hospital settings without a congenital cardiac surgery program, in select centers, PDA ligations can be performed safely by adult cardiac surgeons if no congenital cardiac surgery program is available.

• Investigative Magnetic Resonance Imaging
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• 제22권1호
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• pp.26-36
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• 2018

Purpose: Children born with single ventricle physiology demonstrate poor growth rate and suffer from malnutrition, which lead to increased morbidity and mortality in this population. We assume that an anabolic steroid, oxandrolone, will promote growth in these infants by improving myocardial energy utilization. The purpose of this paper is to study the efficacy of oxandrolone on myocardial energy consumption in these infants. Materials and Methods: We modeled single ventricle physiology in a lamb by prenatally shunting the aorta to the pulmonary artery and then postnatally, we monitored cardiac energy utilization by quantitatively measuring the first order reaction rate constant, $k_f$ of the creatine-kinase reaction in the heart using magnetization transfer $^{31}P$ magnetic resonance spectroscopy, home built $^1H/^{31}P$ transmit/receive double tuned coil, and transmit/receive switch. We also performed cine MRI to study the structure and dynamic function of the myocardium and the left ventricular chamber. The spectroscopy data were processed using home-developed python software, while cine data were analyzed using Argus software. Results: We quantitatively measured both the first order reaction rate constant and ejection fraction in the control, shunted, and the oxandrolone-treated lambs. Both $k_f$ and ejection fraction were found to be more significantly reduced in the shunted lambs compared to the control lambs, and they are increased in oxandrolone-treated lambs. Conclusion: Some improvement was observed in both the first order reaction rate constant and ejection fraction for the lamb treated with oxandrolone in our preliminary study.

• Pediatric Infection and Vaccine
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• 제27권1호
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• pp.62-68
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• 2020

급성 세균성 부비동염은 소아에서 흔하게 발생하는 질환 중 하나로, 바이러스성 상기도 감염 후 5-13%에서 동반하는 것으로 알려져 있다. 접형동에 국한된 부비동염이 발생할 확률은 모든 부비동염의 3% 미만이나 접형동의 구조적 특성상 주위 조직으로 감염이 전파되면 치명적일 수 있다. 비피막형 인플루엔자균(non-typeable Haemophilus influenzae[NTHi])은 급성 세균성 부비동염의 흔한 원인균이나 정상면역인 환아에서 균혈증으로 파급되는 경우는 매우 드물다. 저자들은 특별한 기저질환이 없는 소아가 발열과 두통으로 내원하여 균혈증을 동반한 NTHi에 의한 편측 접형동에 국한된 부비동염이 확인되어 항생제 및 수술적 치료로 호전된 예를 경험하여 보고하는 바이다.

• Journal of Chest Surgery
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• 제29권11호
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• pp.1191-1196
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• 1996

최근에는 폐동맥고혈압이 있는 심실중격결손증에서는 환아의 체중이 10Kg이하이거나 1세 이하라도 조기에 수술을 하는 것이 추천되고 있으며 본원에서도 같은 방침으로 개심술을 시행하여 왔다. 본원에서는 1986년 10월부터 1995년 12월까지 체중이 10Kg이하인 심실중격결손증환자 88명을 개심술로 수술하여 그 사망률을 환아의 연령, 체중 그리고 폐동맥고혈압의 정도에 따라 비교하였다. 총 사망자 수는 10명이었고(11.4%), 6개월 이하의 환아 수술에서는 14명중 5명이 사망하였고(35.8%), 6개월에서 12개월 사이에서는 43명중 4명이 사망하였고(9.3%), 1년 이상된 환아의 수술에서는 31명중 1명이 사망하였다(3.2%). 그러나 폐동맥고혈압의 정도에 의해 사망률을 비교한 결과는 큰 차이를 보이지 않았다. 그리고 6개월 이하의 수술례에서는 폐동맥고혈압의 정도에 관계없이 사망율이 높았다. 이상의 결과로 10Kg 이하의 저체중 심실중격결손증의 수술은 극심한 심부전이나, 성장부전이 있거나 폐동맥고혈압이 비가역적인 폐혈관 질환을 야기할 정도가 아니면, 적어도 6개월 이상 지나서 시행하는 것이 좋을 것으로 사료된다.

• Clinical and Experimental Pediatrics
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• 제54권2호
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• pp.86-89
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• 2011

Traumatic ventricular septal defect (VSD) resulting from blunt chest injury is a very rare event. The mechanisms of traumatic VSD have been of little concern to dateuntil now, but two dominant theories have been described. In one, the rupture occurs due to acute compression of the heart; in the other, it is due to myocardial infarction of the septum. The clinical symptoms and timing of presentation are variable, so appropriate diagnosis can be difficult or delayed. Closure of traumatic VSD has been based on a combination of heart failure symptoms, hemodynamics, and defect size. Here, we present a case of a 4-year-old boy who presented with a traumatic VSD following a car accident. He showed normal cardiac structure at the time of injury, but after 8 days, his repeated echocardiography revealed a VSD. He was successfully treated by surgical closure of the VSD, and has been doing well up to the present. This report suggests that the clinician should pay great close attention to the patients injured by blunt chest trauma, keeping in mind the possibility of cardiac injury.